I know it might me a bit late now... But for wired broadband go for net gear and choose one which has mimo (multiple in multiple out) technology which gives secure stable connection without dropout. Also, go for one which supports the wireless standard 802.11n which is faster. But if you rally want to protect yourself against the future choose one which is dual band with the additional band at 5ghz which the latest high end laptops use.
For mobile broadband three have come out with a new high performance 3G dongle which they call premium. It uses HSDPA technology and mimo for multiple channel use and hence higher speed. I have seen this démo'd on canal drifters NB and it is significantly better than my iPad 3G. He had 4 bars at the Derwent barrage, and I had nothing! It can even be orientated physically to pick up a better signal like any antennae.